Two former and two current Transportation Security Administration employees were accused of allowing large amounts of cocaine and other drugs to pass through X-ray machines at security checkpoints in exchange for cash, authorities said Wednesday.

The indictment involving drug conspiracy and bribery charges outlined five incidents where the employees took payments of up to $2,400 to provide drug couriers unfettered access at Los Angeles International Airport over a six-month period last year.

“The allegations in this case describe a significant breakdown of the screening system through the conduct of individuals who placed greed above the nation’s security needs,” said U.S. Attorney Andre Birotte Jr.